Remove BWC tests (opensearch-project#721)

Signed-off-by: Yury Fridlyand <yuryf@bitquilltech.com>
Signed-off-by: Chen Dai <daichen@amazon.com>

.github/workflows/sql-test-and-build-workflow.yml

@@ -22,9 +22,6 @@ jobs:
     - name: Build with Gradle
       run: ./gradlew build assemble
 
-    - name: Run backward compatibility tests
-      run: ./scripts/bwctest.sh
-
     - name: Create Artifact Path
       run: |
         mkdir -p opensearch-sql-builds

integ-test/build.gradle

@@ -187,6 +187,10 @@ task compileJdbc(type: Exec) {
     }
 }
 
+/*
+BWC test suite was running on OpenDistro which was discontinued and no available anymore for testing.
+Test suite is not removed, because it could be reused later between different OpenSearch versions.
+*/
 String bwcVersion = "1.13.2.0";
 String baseName = "sqlBwcCluster"
 String bwcFilePath = "src/test/resources/bwc/"